eichler bathroom tile scheme?

I know I posted this question before....my 1964 Eichler bathrooms have gray/black/white mosaic tile on the bottom in the shower, but light yellow square tile on the bathroom walls and shower walls. When I first saw the house I thought the mosaic tile looked a lot older than the wall tile, and since the colors seemed to not match, I concluded that the square tile was redone. When I posted this question, someone said that the wall tiles were a black/white/grey brick tile scheme. That seemed to make sense, until today I saw my next door neighbor's house, and he too said that his tile had the mosaic on the bottom and a pale yellow tile on the sides. Now I question if this might have been original. Anyone know that answer?